Consulting-Specifying Engineer, June 2014, by Jerry Bauers and George W. Houk.
http://www.csemag.com/single-article/glazing-systems-considerations-for-the-mechanical-engineer/116b8a44a720582d1d2543d7712a2ca4.html

"Window glazing and shading or louvers have a direct impact on the HVAC load of a building. Mechanical engineers often are tasked with specifying window and shading systems. Know about building envelope, and how it can be managed/altered by window system selection."